Fracture features of granite under various deformation conditions

Locating the spatial region of a future fracture nucleation based on analyzing energy distributions of acoustic emission signals

“…7a). The failure mechanism, which was described in detail in (Kadomtsev et al, 2011), has changed in this case.…”

“…Numerous experimental studies of rock deforma tion analyzed by us (Kadomtsev et al, 2011) and other researchers (Lockner et al, 1992;Petru álek et al, 2013) showed the initially chaotic and then localized formation of the defects (fracture nucleus formation). A macrofracture (disintegration) is related precisely to the localized defect formation stage.…”

“…Ignoring the causes (Kadomtsev et al, 2011), we note that the defects were chaotically formed in the entire sample volume up to its destruction in the experiments (Stanchits et al, 2003) on the deforma tion of a granite sample completely saturated with water. Localization is not observed.…”

“…OF ROCK SAMPLES UNDER LABORATORY CONDITIONS A detailed spatial time analysis of the experimental fracture development was performed in (Kadomtsev et al, 2011). This work analyzed in detail the distribu tions of AE signals registered during different defor mation stages.…”

To the Theory of Formation of Large Cracks in Brittle Solids

“…The processes of fractures of brittle solid bodies on small scales determine the behavior of a system on large scales. The experimental studies of acoustic emission signals accompanying cracks in granites showed that there are two fracture stages [1,2]. At the first stage, the cracks formed are randomly distributed in the sample volume.…”